Abstract: Provided is a technology whereby linking operations and user convenience in operations after cable connection between electronic devices are improved. A main device and an external device are connected by a cable. The main device includes a control circuit, a display circuit, a display unit, a communication circuit, a storage device, and a connector with an insertion detection terminal attached thereto. The control circuit, in addition to handling overall control of each of the constituent elements, executes content reproduction control and the like, or acquires user instructions from user interfaces such as buttons and performs the desired operation. The control circuit also acquires connection detection information relating to the cable from an insertion detection circuit, and performs an operation (operation A or operation B) matching the sequence in which the cable is connected.